It’s always a long day… 86400 doesn’t fit into a short.
In case you don’t get it, “long” is a data type – 86400 is a “long” integer, as opposed to a “short” integer, which can’t hold bigger numbers. If you know you’re only going to be dealing with small numbers, you would use a “short” integer to save memory space in your program. (And 86400 is the number of seconds in a day.)
Ah well, I still think it’s funny. In case you we wondering, I found it here. There are quite a few other funny ones there, if you look around.